I just installed Nimbus in FF 28.0 and in Pale Moon 25.3.2. The result in both browsers is the same: it doesn't work.- The Options button is missing in the Add-ons Manager- The Nimbus button is missing in the browser. When clicking Customize it's not available to add to any bar.I have already tried- reinstalling Nimbus- removing all other add-ons and reinstalling Nimbus- reinstalling FF/PM without other add-ons and installing Nimbusbut the result is always the same.Anything else I can try?